Actually i just happen to be smart at this one and the answer above is wrong look it up. cocci bactertia are a spherical shape and this one particularly will be single notice cocci not coccous. no offense to answer above
This control is called negative feedback. Mechanism of negative feedback. Each metabolic reaction or process is regulated by several enzymes. These enzymes control the rate of these reactions and thus are fundamental in maintaining homeostasis. In a negative-feedback pathways, the end product of a pathway binds to the allosteric site of the first enzyme, closing its active site and blocking the rest of the reactions.
These are called Circumvallate papillae